Chelik yong’inga qarshi eshiklarning tasnifi aniq. Chelik yong’inga qarshi eshikning turli xil yong’inga chidamliligiga ko’ra, uning yong’inga chidamliligi A, B, C uchta sinfga bo’linishi mumkin, turli xil po’lat yong’inga qarshi eshiklar turli joylarga qo’llanilishi mumkin.

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